ENGINEERING THERMODYNAMICS QUIZ

Stirling cycle consists of

Two constant volume and two isothermal processes

Two constant pressure and two isothermal processes

Two constant volume and two isentropic processes

One constant volume, one constant pressure and two isentropic processes

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The heat and mechanical energies are mutually convertible. This statement was established by

Boyle

Charles

None of these

Joule

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The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)

dQ = ds/T

δQ = T.ds

δQ = T/ds

None of the listed here

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A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

Otto cycle

Stirling cycle

Diesel cycle

Carnot cycle

TRUE ANSWER : ?
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The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)

(T1/T2) - 1

1 + (T2/T1)

1 - (T1/T2)

1 - (T2/T1)

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Compressed air coming out from a punctured football

May become hotter or cooler depending upon the humidity of the surrounding air

Becomes cooler

Remains at the same temperature

Becomes hotter

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The atomic mass of nitrogen is __________ oxygen.

Equal to

None of these

More than

Less than

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An isothermal process is governed by

Gay-Lussac law

Boyle's law

Avogadro's law

Charles' law

TRUE ANSWER : ?
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The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

Remain unchanged

Decrease

Increase/decrease depending on application

Increase

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During throttling process

No work is done by expanding steam

Heat exchange does not take place

There is no change of internal energy of steam

All of these

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